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Juvenile chronic arthritis in black and Indian South African children
Insights
This study highlights juvenile chronic arthritis (JCA) in South African children, noting a polyarticular onset predominance and high rheumatoid factor positivity. Key differences were observed compared to JCA in Caucasian populations.
Area of Science:
- Rheumatology
- Pediatric Rheumatology
- Immunology
Background:
- Juvenile chronic arthritis (JCA) research is limited in African children.
- Understanding JCA in diverse populations is crucial for accurate diagnosis and treatment.
Purpose of the Study:
- To investigate the clinical and serological features of JCA in Black and Indian South African children.
- To compare these features with those reported in Caucasian populations.
Main Methods:
- Retrospective study of 60 Black and Indian children diagnosed with JCA.
- Analysis of clinical presentation, joint involvement, and serological markers (Rheumatoid Factor, Antinuclear Factor, Antistreptolysin O).
Main Results:
- Predominance of polyarticular JCA onset; low occurrence of pauci-articular onset.
- High prevalence of positive Rheumatoid Factor (RF) and low Antinuclear Factor (ANA) positivity.
- Equal overall sex ratio, with male preponderance in limited joint subgroup.
- Common initial findings: low hemoglobin, normal white blood cell count, elevated ESR, positive ASO titre.
Conclusions:
- South African Black and Indian children with JCA exhibit distinct patterns compared to Caucasian children.
- High polyarticular onset and seropositivity (RF+) are characteristic.
- Absence of a distinct pauci-articular subgroup with ANA+ differentiates this cohort.
Abstract:
Although juvenile chronic arthritis (JCA) has been studied extensively in Whites in Western countries, very few data exist on JCA in children in developing countries and particularly in Africa. Accordingly, a retrospective study of 60 Black and Indian children with JCA was undertaken. The main findings were predominance of JCA of polyarticular onset with a relatively low occurrence of JCA of pauci-articular onset, a high prevalence of positive rheumatoid factor tests and a very low number of patients positive for antinuclear factor, and an equal overall sex ratio (however, there was a preponderance of males in the subgroup with JCA involving only 2 - 4 joints). Moreover, the vast majority of patients initially had a low haemoglobin concentration, a normal white cell count, an elevated erythrocyte sedimentation rate and a positive antistreptolysin O titre. The main differences between Black and Indian South African children with JCA and White children with the disease in Europe and North American appear to be the high prevalences of polyarticular onset and seropositivity, the equal sex ratio and the absence of a specific subgroup with pauci-articular onset and a positive antinuclear factor test.